java實現超市管理系統

import java.util.Arrays;

public class Goods {
 private int id;
 private double price;
 private String name;

 public Goods(int id, double price, String name) {
  this.id = id;
  this.price = price;
  this.name = name;
 }

 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }

 public double getPrice() {
  return price;
 }

 public void setPrice(double price) {
  this.price = price;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public Goods() {
 }

 //增加商品
 public Goods[] add(Goods[]goods,Goods newGood){
  goods= Arrays.copyOf(goods,goods.length+1);
  goods[goods.length-1]=newGood;
  return goods;
 }
 //刪除商品
 public static Goods[] del(Goods[]goods,int id){
  int i=0;
  while(true){
   if(goods[i].getId()==id){
    goods[i]=null;
    return goods;
   }
   i++;
   if(i>=goods.length){
    return goods;
   }
  }

 }
 //添加商品
 public static Goods[] change(Goods[]goods,int id,int newId,double newPrice,String newName){
  int i=0;
  while (true){
   if(goods[i].getId()==id){
   goods[i].setId(newId);
   goods[i].setPrice(newPrice);
   goods[i].setName(newName);
   return goods;
  }
   i++;
   if(i>=goods.length){
    return goods;
   }
  }
 }
}

import java.util.Scanner;

public class marketManager {
 public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  Goods g1=new Goods(1000,10,"筆記本");
  Goods g2=new Goods(1001,2,"西紅柿");
  Goods g3=new Goods(1002,5,"辣條");
  Goods []goods={g1,g2,g3};
  while (true) {
   System.out.println("========超市管理系統=======");
   System.out.println("1.貨物清單 2.增加商品 3.刪除商品 4.修改商品 5.退出");
   System.out.println("請輸入你要操作的編號：");
   int i = sc.nextInt();
   switch (i){
    case 1:
     System.out.println("=======商品清單=======");
     System.out.println("商品編號"+"\t\t"+"商品單價"+"\t\t"+"商品名稱");
     for (Goods a:goods) {
      if(a==null){
       continue;
      }
      System.out.println(a.getId()+"\t\t"+a.getPrice()+"\t\t"+a.getName());

     }
     continue;
    case 2:
     System.out.println("你選擇的是增加商品的功能");
     System.out.println("請輸入你要添加的編號：");
     int Id = sc.nextInt();
     System.out.println("請輸入你要添加的商品價格：");
     double price = sc.nextDouble();
     System.out.println("請輸入你要添加的商品名稱");
     String name = sc.next();
     Goods good=new Goods(Id,price,name);
     goods = good.add(goods, good);
     System.out.println("添加成功！");
     continue;
    case 3:
     System.err.println("你選擇的是刪除商品功能");
     System.out.println("請輸入你要操作的編號：");
     Id = sc.nextInt();
     goods=Goods.del(goods,Id);
     System.out.println("刪除成功！");
     continue;
    case 4:
     System.out.println("你選擇的是修改商品功能");
     System.out.println("請輸入你要操作的編號：");
     Id=sc.nextInt();
     System.out.println("請輸入修改後的編號：");
     int newId = sc.nextInt();
     System.out.println("請輸入修改後的價格：");
     double newPrice = sc.nextDouble();
     System.out.println("請輸入修改後的商品名稱：");
     String newName=sc.next();
     goods=Goods.change(goods,Id,newId,newPrice,newName);
     continue;
    case 5:
     return;
   }


  }
 }
}